<?php

/*
 * Tomato Framework
 * 
 * Copyright 2012-2012 Luax.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * 
 * @link http://www.tomatoframework.com
 * @link http://www.luaxlou.com
 * @version $Id: PDOAdapter.class.php 13 2012-03-15 15:35:54Z luaxcn@gmail.com $
 */

/**
 * 
 *
 * @author Luax <luaxcn@gmail.com>
 */
class PDOAdapter
{

    private $pdo;

    public function __construct($params)
    {
 

        $charset = @$params['charset'] == null ? 'UTF8' : $params['charset'];


        $dsn = sprintf("%s:dbname=%s;host=%s;port=%s"
                , @$params['driver'], @$params['dbname'], $this->choiceHost(@$params['host']), @$params['port']);
      
        
   
        $this->pdo = new PDO($dsn, @$params['username'], @$params['password'], array(PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES '{$charset}'"));
    }

    private function choiceHost($host)
    {

        $hosts = explode('|', $host);
        $noOfHost = sizeof($hosts);
        if ($noOfHost > 1)
        {
            return $hosts[time() % $noOfHost];
        }
        return $host;
    }
    
    public function getPrototype()
    {
        return $this->pdo;
    }
}

?>